christianesperar/Ruby Factorial Method

## Ruby Factorial Method
class Integer
    def factorial
        result = 0
        self.downto(1) { |number| result == 0 ? result = number : result *= number }
        return result
    end
end
	class Integer
	def factorial
	result = 0
	self.downto(1) { \|number\| result == 0 ? result = number : result *= number }
	return result
	end
	end